A faulty HVAC system can cause discomfort, raise energy bills, and even become a health hazard. If your HVAC system isn’t working correctly, it’s important to identify and address the problem as quickly as possible. While numerous issues can be to blame for your HVAC system not working, some are more common than others. Here are 20 possible reasons why your HVAC system may not be working.

1. Faulty Thermostat

The thermostat is responsible for regulating the temperature within your home. If the thermostat isn’t working properly, it may be causing issues with your HVAC system. This could be due to a poorly calibrated thermometer, faulty wiring, or an outdated thermostat that isn’t compatible with your HVAC system.

2. Tripped Circuit Breaker

HVAC systems require a lot of power to operate. If the circuit breaker that supplies power to your HVAC system is tripped, then your HVAC system won’t work. If this is the case, you’ll need to reset your circuit breaker before attempting any other repairs.

3. Clogged Filter

The filter in your HVAC system helps to keep the air clean by trapping dust, dirt, and other airborne particles. If the filter becomes too clogged or dirty, it won’t be able to properly do its job, reducing airflow and causing your HVAC system to malfunction. Be sure to change your filter regularly to help keep your HVAC system running smoothly.

4. Leaky Ducts

Leaks in your ductwork can cause a decrease in airflow, leading to difficulty heating and cooling your home. This issue is especially common when the ducts are old and need to be replaced. If your ducts are leaking, then they should be repaired or replaced as soon as possible.

5. Low Coolant

The coolant in your HVAC system helps to keep the air cold during hot summer days. If your HVAC system is low on coolant, it won’t be able to properly cool your home. Low coolant levels often occur due to leaks or routine maintenance that wasn’t completed at the proper intervals.

6. Damaged Wiring

Wiring that is frayed, damaged, or exposed can cause a number of issues with your HVAC system. This could include reduced airflow, poor temperature control, or even a complete system shutdown.

7. Dirty Exterior Unit

The exterior unit of your HVAC system is responsible for dispersing hot and cold air. If the outdoor unit is dirty or clogged with debris, it can’t perform at peak efficiency. Cleaning the exterior unit is a simple task that can help improve your HVAC system’s performance.

8. Blocked Vents

If your vents are blocked by furniture, curtains, or other objects, then it will be difficult for your HVAC system to properly distribute air throughout the house. Make sure that all of your vents are unobstructed to help ensure that your HVAC system is working properly.

9. Failed Compressor

The compressor is the heart of your HVAC system and is responsible for pumping refrigerant throughout the system. If the compressor fails, it won’t be able to properly circulate cool air throughout your home. Replacing a failed compressor can be expensive, so it’s important to take preventative measures to help ensure that your compressor is in good working order.

10. Broken Starting Components

Your HVAC system has a number of starting components that help it turn on and off. If these components become damaged or worn out, they’ll be unable to do their job, resulting in your HVAC system not working.

11. Blown Fuse

If a fuse within your HVAC system blows, it will cause the system to shut down. If you’re experiencing problems with your HVAC system, it’s a good idea to check the fuse to make sure it hasn’t blown.

12. Dirty Coils

The evaporator and condenser coils in your HVAC system transfer heat from the air to the refrigerant. If these coils become covered in dirt, dust, or grime, it can cause the system to overheat and result in reduced airflow. Cleaning the coils regularly is a simple way to help ensure that your HVAC system is running efficiently.

13. Stopped Thermal Expansion Valves

The thermal expansion valve helps to regulate the flow of refrigerant in your HVAC system. If this valve stops working properly, your system can freeze up, resulting in decreased performance.

14. Outside Fan Malfunction

The outside fan draws in air from the outside and helps cool your home. If the fan stops working, it won’t be able to effectively cool your home and could lead to major HVAC system problems.

15. Power Outage

If your HVAC system loses power, it will no longer be able to heat or cool your home. You should always check the power supply to your HVAC system when it’s not working properly.

16. Aging System

HVAC systems typically have a lifespan of 15-20 years. If your system is older than this, it may be time to consider replacing it. An aging system may be prone to more frequent breakdowns or may not be able to keep up with the changing temperature outside.

17. Incorrectly Sized HVAC System

Your HVAC system needs to be properly sized to your home in order to work efficiently. If it is too small, it won’t be able to handle the load and will struggle to keep up. Likewise, if it is too large, it will cycle on and off frequently, causing an increase in energy bills. Having a professional size your HVAC system correctly can help ensure that it runs smoothly and efficiently.

18. Poorly Installed System

Even if you have the right size HVAC system, it won’t work properly if it isn’t installed correctly. Poorly installed HVAC systems can be inefficient, prone to breakdowns, and even dangerous. Make sure to have a qualified technician install your HVAC system for the best results.

19. Lack of Maintenance

Regular maintenance is one of the most important steps to keep your HVAC system running smoothly. Regular tune-ups can help identify and fix small problems before they become big, costly issues. Having your HVAC system inspected and maintained regularly can save you money and headaches in the long run.

20. Weather-Related Damage

Harsh weather can take its toll on your HVAC system. Heavy snow, high winds, and extreme temperatures can all cause damage to the system, resulting in reduced efficiency and even complete breakdowns.

Ultimately, only a qualified HVAC technician can tell you what’s wrong with your system and how to fix it. Regular maintenance and inspection is the best way to prevent major issues and keep your system running smoothly. If you think that something is wrong with your HVAC system, don’t hesitate to call At Your Service Heating & Cooling LLC for assistance. As one of the top providers of cooling, heating, indoor air quality, and plumbing services in the Baltimore area, we are here to help you get your HVAC system back up and running. Contact us today for more information about our services.

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